Solex Network Solutions

Courses / IMS, VoLTE and VoNR

Intermediate

IMS, VoLTE and VoNR

SIP signalling that actually connects the call

Who this is for

Voice engineers, core engineers and anyone who has been handed an IMS ladder diagram and asked why the call dropped at 183.

What you will be able to do

  • Read a full SIP registration and INVITE dialog and say exactly where it failed
  • Explain what each CSCF adds to the message and why the order matters
  • Follow SDP offer/answer through preconditions and know when early media is legitimate
  • Trace a VoLTE call into VoNR and back out through SRVCC

Prerequisites

Comfortable with IP and UDP/TCP. SIP is taught from the beginning.

Syllabus

Week 1

3 lessons

Week 2

3 lessons
  • IMS registration, message by messageP-CSCF discovery, the 401 challenge, IPsec security associations and the 200 OK.28:00
  • Cx and the HSSUAR/UAA, MAR/MAA, SAR/SAA - the Diameter behind S-CSCF assignment.19:00
  • Third party registration and iFCInitial filter criteria, service point triggers, and how the TAS gets involved.24:00

Week 3

3 lessons
  • Originating call flowINVITE through the originating chain, 100rel, PRACK and the UPDATE for preconditions.26:00
  • Terminating call flowLocation retrieval, forking, and the 180/183 distinction people get wrong.26:00
  • Media, RTP and RTCPWhat actually carries the voice, jitter buffers, and where the AMR mode is decided.24:00

Week 4

2 lessons
  • VoLTE end to endFrom default bearer to dedicated bearer, QCI 1 and QCI 5, and the Rx interface.21:00
  • Dedicated bearers and the PCRFAAR/AAA, the rule that creates the voice bearer, and what happens if it fails.22:00

Week 5

2 lessons
  • VoNR end to endThe same call over 5G: 5QI 1, N5 to the PCF, and what changed from VoLTE.20:00
  • EPS fallbackWhy the network hands the call back to LTE, the triggers, and the delay it costs you.30:00

Week 6

2 lessons
  • SRVCC and continuitySingle radio voice call continuity, the ATCF/ATGW, and mid-call handover.25:00
  • Supplementary servicesCall forwarding, hold, conference and MMTEL - and where they are implemented.27:00

Week 7

2 lessons
  • Emergency callsThe separate registration, the E-CSCF, and location delivery.20:00
  • IMS troubleshooting workshopFive real captures, five real faults, one repeatable method.20:00

Common questions

How do I get access after I pay?

Pay by UPI, upload the payment screenshot on your order page, and we verify it and send your login details by email and WhatsApp - usually within a few hours.

Which course should I start with?

If you are new to the core network, start with 4G LTE and EPC. If you already know 4G, go straight to 5G Core. Not sure? Message us on WhatsApp and we will suggest one.

Can I watch on my phone?

Yes. Lessons play in the browser on any phone, tablet or laptop - there is nothing to install.

How are the lessons released?

Week by week from your start date, with a short quiz after each module so you can check your understanding.

Do I need my own lab or equipment?

No. Every procedure is shown on our own live core, with the real messages and traces, so you can follow along without any equipment.

Can you train my whole team?

Yes. We run corporate batches with a syllabus built around your technology and your rollout. See Corporate training, or contact us.

Ready to start?

Tell us where you are today and what you want to be working on in six months. We will point you at the right track - and be honest if we are not the right fit.

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₹7,499 ₹9,99917 lessons
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